Furnace for melting metal.



A, H.. OAKLEY. PUB-HAW FOR MELTING METAL. APPLICATION FILED AE1?..20,1905.

Patented Aug, 16, 1910.

Inuefi-Eov Albk H. 0

' earner.

V To all whom it may concern:

v UNITED S TES PATENT orrrcn' ALBERT H. lJAKLEY, OF MILLIBURY,MASSACHUSETTS ASSIGNOR, B Y MESNE ASSIGN- MENTS, 'IO WILLIAM E. OAKLEY,vor MILLBUR MASSACHUSETTS.

run'naon ron Mnmme METAL.

Be it known that I, ALBERT H. OaKnnr, a citizen of the United'States,

residing at Mill- 'bury, in the county of Worcester and Conn monwealthof 'Massachusetts, have invented a new and useful Improvement in aFurnace for Melting Metal, of which the following is a specificationaccompanied by drawings forming a part of the same, in whioh- Figure 1represents a plan View of a furnace embodying my invention. Fig. 2 isacentral, longitudinal, sectional view on line 2-2, Fig. 1, and Fig. 3 isa sectional View on broken line 3-3, Fig. 2.

Similar reference letters and figures refer to similar parts in thedifferent views. My invention relates to a furnace designed for meltingmetal in-crucibles and it relates to certain features of constructionand arrangement of parts as hereinafter described and pointed out in theannexed claims, whereby the efficiency of the furnace is'materiallyincreased and the mixture of air and gas1 forming the fuel is broughtunder contro My improved furnace comprises a heating chamber 1 in whichthe crucibles areto be placed, a series of pans 2 for liquid fuel, amixing chamber 3 for mixing air with the gas produced by the combustionof the liquid fuel, a vertical stack or escape flue 1 and anintermediate heating chamber 5 between the escape flue and the crucibleheating chamber til) 1. Oil is supplied to the fuel pans 2 by a feedpipe 6. The products of combustion from the liquid fuel 1n the pans 2are carried into the mixing chamber 3 and bymeans of openings 7 and 8are conducted through the crucible heating chamber 1 to the heatingchamber 5, and from thence to the escape flue 4;. A series of smallopenings 9 are made through the front wall of the mixing chamber-3 toadmit currents of air to and thoroughly distribute them throughout themixing chamber, in order to secure a more intimate commingling ofairwith the products of combustion in the mixing chamber. The top of themixing chamber is provided with a cover 10 which is capable of beingadjusted to vary the opening into the mix ing chamber and control thequantity of air admitted to the mixing chamber. Arranged transversely tothe heating chamber 5 and near th bottom, is a coiled pipe 11 connectedwith a source of water supply by a feed pipe 12, and also communicatingwith an expansion tank 13. The coiled pipe 11 is connected by a pipe 14with a coiled pipe 15 placed in the upper part of the air space 16through which Ward draft to the fuel pans 2. The coiled pipe 15 isconnected by a pipe 17 with a placed in the top of the mixcoiled pipe 18ing chamber 3, and the coiled pipe 18 is connected by a return pipe 19with the coiled pipe 11, thereby producing a complete Water circulationbetween the coiled pipes 11 in which the Water is heated and the coiledpipes 15 and 18 by which heat is lfmgiarted to the downward currents ofair to the fuel chamber 3.

The operation of my improved furnace is as follows r Fuel is supplied tothe uppermost of the fuel pans 2 through the supply pipe'fi, and fromthe uppermost pan fuel is supplied, to the lowermost pan by a suitableoverflow pipe 20. The surface of the fuel is then ignited and airpassing from the chamber 16 over the tops of the fuel pans pans 2 and tothe mixing through the passages 7, crucible chamber 1 and passage 8 tothe heating chamber 5, Where it heats the Water in the coiled pipe 11and escapes through the flue 1. Minute currents of air are admittedthroughthe restricted openings 9 from the air chamber 16 into the mixingchamber 3 in nearly suflicient quantities to form an efficient heatingmixture with the gas generated from the burning fuel. The remaining airnecessary to complete the mixture is admitted to the top of the mixingchamber 3 by partially Withdrawing the cover 10 and the amount of airthus admitted as required to produce the best results is controlled bythe adjust ment of the cover 10. The air admitted toair is admitted by adown Patented Aug.16,1910.

carries the flame into the mixing chamber 3,

is heated by its contact with the coiled pipes 18, and this heat issupplied from the coiled pipe 11 placed in the heating chamber which theWaste heat in its passage from the crucible chamber 1 to the flue 4 isutilized. The difference in the level between the coils 15 and 18 andthe heating coil 11 is suflicient to secure a suitable watercirculation.

- mg the air so admitted;

.able means for admitting air from outside said air chamber to saidmixing chamber,

and means forheating the air so admitted.

2. A furnace'having affuel mixing cham ber andan' air chamber,m eans forheating the air in said air chamber, separate passages from said airchamberto said mixing chamber, pans for liquid fuel placed in one ofsuch passages, ad ustable means for admitting air from outside said airchamber to said; mixing chamber, and means for heat- 3. A; furnacehavlng a fuel mixingchamber and an air chamber; both of saidchambershaving separate entrances for air and also alr passagesconnecting said chambers,

means ior admitting an inflammable mixture, to said mixing chamber, anda water c1rcu-- lation, comprising a coil of pipe in the path of theproducts of combustion from. said mixingchamber, a separate c011 of plpeat Y the entrancefto each chamber, said separate coils arranged upon ahigher plane than said first C011, and pipesconnectmg said C0115.

4. A furnace having a fuel mixmg chamher and an air chamber, both ofsaid chambers haying separate entrances for air and also air passagesbetween said chambers,

means for admitting an inflammable mixture to said mixing chamber, and aWater circulation, comprising a coil of pipe in the path of the productsof combustion from said IIllXlIlg chamber, a'separate coil of pipe inthe'path of the air admitted to each chamber, and pipes connecting saidcoils.

5. The combination of a crucible heating chamber and an escape flue, ana1r chamber, a heating chamber between said crucible heating chamber andsaid escape flue, and

coiled pipes in said air chamber and in said heating chamber betweensaid ClllClblB heat- ,ing,cha,1nber ands aid escape fine forming .partofa hot water circulatlon, said water sing heated in said heating chamberand designed to warm the air in said air chamber.

6, In a crucible heating furnace, the combination With agcrucibleheating chamber and an escapefiue, of an air chamber, a hot water coilin said air chamber and a semnd hot Water coil in the path offthcproducts of combustion to said escape flue, and means for connectingsaid water coils, whereby a water circulation is established. I

7; A furnace having a liquid fuel burner, a mixing chamber to receivethe products of combustion from said burner, means fm' admitting airto,said mixing chamber, and a Water circulation, comprising a coil ofpipe in the path ofsaid products of combustion from said chamber, asecond coil of pipe in the path of the air admitted to said chamber andpipes connecting said coils.

ALBERT H. OAKLEY. Witnesses:

' PENELOPE Comnnrnxcn,

RUFUS B. FOWLER.

